subkernel: add support for (d)dma

src/satman/src/routing.rs

@@ -89,7 +89,7 @@ impl Router {
         }
     }
 
-    // called by local sources (DDMA, kernel) and by repeaters on receiving async data
+    // Called by local sources (DDMA, kernel) and by repeaters on receiving async data;
     // messages are always buffered for both upstream and downstream
     pub fn route(
         &mut self,
@@ -125,7 +125,7 @@ impl Router {
         }
     }
 
-    // Sends a packet to a required destination, routing if it's necessary
+    // Sends a packet to a required destination, routing if necessary
     pub fn send(
         &mut self,
         packet: drtioaux::Packet,